Electric-lamp globe



Feb. 12 1924. 1 1,483,716

B. B. CHOINSKI ELECTRIC LAMP GLOBE Filed April 1921 11 11 I L 1/ NVENTORS Patented Feb. 12,

s t T BRUNO B. CHOINSKI, OF MILNAUKEE, VTISCONSIIT, ASSIGNOR FOETY-NINE ONE- HUNDREDTHS TO STANLEY A. LAJXIGE, OF MILVTAUKEE, WISCONSIN.

ELECTRIC-LAMP GLOBE.

Application filed. April 6,

The object of my invention is to provide means whereby the liquid may freely expand and contract without developing pressure and without admitting dust or other material which might discolor the liquid or the enclosing walls of the receptacle; also to pro vide means whereby a globe o'f. the described class can be formed of separable parts which can easily be separated and replaced to facilitate the removal and replacement of the liquid and the cleansing of the walls; also to provide a globe ot the class described which can be easily manufactured at minimum expense.

It is a further object of this invention to provide electrical lamps with a double walled globe having a liquid interposed be 30 tween the walls, whereby the rays of light passing through the globe above the horizontal radial line will be retracted downwardly, thereby obtaining a better downward concentration. of the light. It is further desired in accomplishing this object to provide a double walled globe which will concentrate the light downwardly and which will not produce dark areas in the space below the horizontal radial line of said globe.

The drawing shows an embodiment of my invention in vertical section exposing the lamp.

The lamp 1 may be of any ordinary construction: It is enclosed within a glass tube 2 having a spherically rounded lower end 3 and an integrally formed screw thread 4 at its upper end adapted to receive the similarly threaded shank portion 5 of a globular member 6 which encloses the lower portion of the tube 2 and is spaced therefrom sufficiently to provide a chamber 7 adapted to be filled with liquid, preferably distilled water, altho other transparent liquids may be employed if desired. The globular member 6 is formed of glass and the threaded 1521. Serial No. 459,113.

portion 5 is integrally formed. These glass screw threads lit loosely upon each other and allow air and vapor to pass into and out of the cavity 7, thereby permitting an expansion and contraction of the liquid without developing pressures upon the walls of the tube 2 or the globe 6, either during expansion of the liquid such as might otherwise develop internal pressure or contraction such as might develop a vacuum within the chamber or cavity 7' it air were not admitted. The screw threads, however, fit together with suliicient nicet-y to largely exclude dust and therefore considerable time will elapse before discoloration of the liquid or of the glass surfaces will be noticed.

The caplO covers the upper end of the tube 2, this end being otherwise open. The cap is provided with an annular flange 11 adapted to be screwed upon the threaded portiqn 5 of the globe. The casing 12 of the lamp switch is provided with a ring 13 adapted to encircle an upwardly projecting flange 14011 the cap 10 to which the ring 13 may be secured by set screws 15 in a manner similar to the ordinary practice of securing lamp shades or reflectors in position. By thus securing the casing 12 to the cap 10, it is obvious that the lead wiresv 17 may be utilized to suspend not only the lamp but the globe from an overhead support. This, however, is but one of a great many forms of support which may be used in. connection with the cap 10.

It is obvious that by unscrewing the cap 10 from the threaded portion 5 of the globe, the latter, including both the inner and outer walls 2 and 6 may be bodily removed. Thereupon, by unscrewing the globular member 6 from the tubular member 2, the liquid may be poured out and replaced after cleansing and polishing the glass surface.

I attach considerable importance to the fact. that the cap 10 covers the upper margins of the threaded portions 4 and 5 when the parts are assembled. It will not be possible to screw the cap down in such a manner as to prevent the escape of air or vapor or I the admission of air as above described, but

the cap will materially assist in excluding dust. The cap is preferably provided with apertures 18 which permit air to pass into and out of the lamp receiving cavity 19. These apertures 18 are preferably covered with. caps 20 of dust excluding fibrous material adapted to allow air to slowly pass thru them and also adapted to lift in case any internal pressure should develop in the cavity 19 due to expansion under the influence of heat when the lamp is lighted.

While I have referredto the member (l as globular and to the member 2 as tubular, it will be understood that the form or shape of these members is not material to my invention, a great variety of changes in form and style being possible.

It is desired in the constructionshown that the half-spherical portion 3 of the inner globe be positioned substantially concentrically with the sphericalglobe 6.so that rays of light passing through the globes below the horizontal lines will not be retracted to any appreciable amount. However, it is desired to retract downwardly the rays of light passing through the globes above the horizontal radial lines. Therefore, the tubular portion2 ofrthe inner globe in c0mbination with the liquid 7 and globe v6 is particularly adapted forthe purpose of refractingUthe upper rays downwardly.

I claim:

1. The combination with an electric lamp, of a vglobe supporting member detachably connectedtherewith and provided with an annular .screwthreaded flange, and a globe having spaced inner and outer walls provided with cylindrical threaded portions adapted to be screwed together, one of said threaded portions belng adapted to be screwed to said threaded flange, and a body of light difi'using liquidiinterposed between the unthreaded portions of said walls whereby the liquid may freely vaporize, said threaded portions being adapted to allow the vapor to escape from the cavity formed bythe said inner and outer walls.

2. The combination with an electric lamp provided with a globe supporting threaded cap ring, of a glass tube having a threaded upper end anda closedrounded lower end, a glass globe provided with an opening and a marginal cylindrical flange encircling the opening and adapted for screw threaded engagement with the threaded portionof said tube, said mutually engaging threaded portions being also adapted for screw threaded engagement withthe cap ring and the cap ring being adaptedto cover the upper marginsof the threaded portions of the tube and globe.

3. The combination with an electric lamp, or" an enclosure therefor having spaced inner and outer walls composedof glass and ,pro-

vided with cylindrical, threaded upwardly extending port-ions adapted for Jmutual. engagement, a cap adapted to be screwed to one of saidthreaded portions and covering the upper margins of said portions and the lamp receiving cavity, said cap being provided with apertures having dust excluding coverings adapted to allow air to pass vinto and out of the lamp receiving cavity.

BRUNO B. CHOINSKI. 

